What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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You can use captcha, this would help prevent robots from filling up the form. It uses distorted images that only humans can read.
Captcha is located under quick fields.
Thanks @oldin. As you indicated using CAPTHA fields will eliminate robots to fill in the form.
If you have any other question or issue, please do let us know.